Abstract
Ferroelectric and dielectric properties of barium titanate (BaTiO3) bulk ceramics and thin films have been investigated. The bulk ceramics and thin film samples have been prepared from barium acetate [Ba(CH3COO)2] and titanium(IV)isopropoxide [Ti(CH3)2CHO)4] precursors by sol-gel technique. The as-grown bulk powder and thin films were found to be amorphous, which crystallized to tetragonal phase after annealing at 700°C in air for one hour. The values of the spontaneous polarization (Ps), remanant polarization (Pr) and coercive field (Ec) of the bulk ceramics were found to be 19.0, 12.6 μC cm−2 and 30 kV cm−1 respectively. In the case of the film, the values of Ps, Pr and Ec were respectively found to be 14.0, 3.2 μC cm−2 and 53 kV cm−1. The capacitance-voltage (C-V) characteristics of the film also showed polarization hysteresis. The values of the dielectric constant (ε) of the bulk ceramic and thin film at 1 kHz were found to be 1235 and 370 respectively. Both the films and ceramics showed dielectric anomaly peaks at 125°C, showing ferroelectric to paraelectric phase transition.
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Basantakumar Sharma, H., Sarma, H.N.K. & Mansingh, A. Ferroelectric and dielectric properties of sol-gel processed barium titanate ceramics and thin films. Journal of Materials Science 34, 1385–1390 (1999). https://doi.org/10.1023/A:1004578905297
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DOI: https://doi.org/10.1023/A:1004578905297